InnoDB数据库进程无法启动了
Starting MySQL. ERROR! The server quit without updating PID file (/www/data/twk2.pid).系统：centos6.9 2核4G安装的lnmp1.5数据库引擎默认的是InnoDB,今天手欠发现产生很多错误日志，就点开一个wordpress网站的数据库，点修复报错，然后想着优化一下，就点了一下优化，然后phpmyadmin的root账户直接就从控制面板退出了，后面再登录phpmyadmin就提示Warning: mysqli::mysqli(): (HY000/2002): No such file or directory重启mysql，就提示https://bbs.vpser.net/attachment.php?aid=5551&noupdate=yes
按照咱们论坛的方法修改了数据库目录的权限，重启依然不起作用。
错误日志文件太大了，我直把从新的部分，也是重复的部分保留了，麻烦军哥有空帮看看这是什么情况？以前也出现过这种情况，重装数据库后，原来InnoDB类型的数据库导入失败，直接把文件拷贝过去，在phpmyadmin里面看数据库，显示不出来那些数据库文件。
2019-03-13T04:43:11.683455Z 0 InnoDB: Operating system error number 2 in a file operation.
2019-03-13T04:43:11.683489Z 0 InnoDB: The error means the system cannot find the path specified.
2019-03-13T04:43:11.683494Z 0 InnoDB: If you are installing InnoDB, remember that you must create directories yourself, InnoDB does not create them.
2019-03-13T04:43:11.683500Z 0 InnoDB: Cannot open datafile for read-only: './mylshuo_com/wp1_commentmeta.ibd' OS error: 71
2019-03-13T04:43:11.683505Z 0 InnoDB: Operating system error number 2 in a file operation.
2019-03-13T04:43:11.683509Z 0 InnoDB: The error means the system cannot find the path specified.
2019-03-13T04:43:11.683514Z 0 InnoDB: If you are installing InnoDB, remember that you must create directories yourself, InnoDB does not create them.
2019-03-13T04:43:11.683520Z 0 InnoDB: Could not find a valid tablespace file for `mylshuo_com/wp1_commentmeta`. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting-datadict.html for how to resolve the issue.
2019-03-13T04:43:11.683527Z 0 InnoDB: Ignoring tablespace `mylshuo_com/wp1_commentmeta` because it could not be opened.
2019-03-13T04:43:11.683547Z 0 InnoDB: Operating system error number 2 in a file operation.
2019-03-13T04:43:11.683552Z 0 InnoDB: The error means the system cannot find the path specified.
2019-03-13T04:43:11.683557Z 0 InnoDB: If you are installing InnoDB, remember that you must create directories yourself, InnoDB does not create them.
2019-03-13T04:43:11.683562Z 0 InnoDB: Cannot open datafile for read-only: './mylshuo_com/wp1_comments.ibd' OS error: 71
2019-03-13T04:43:11.683566Z 0 InnoDB: Operating system error number 2 in a file operation.
2019-03-13T04:43:11.683570Z 0 InnoDB: The error means the system cannot find the path specified.
2019-03-13T04:43:11.683585Z 0 InnoDB: If you are installing InnoDB, remember that you must create directories yourself, InnoDB does not create them.
2019-03-13T04:43:11.683591Z 0 InnoDB: Could not find a valid tablespace file for `mylshuo_com/wp1_comments`. Please refer to http://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting-datadict.html for how to resolve the issue.
innodb是不能直接拷贝目录的，拷贝了也没法用，只能是导出数据库才行
回复 2# 的帖子
嗯 ，谢谢军哥，已经解决了，这种问题遇到的次数还是挺多的，之前也遇到过，后面把服务器重装了，innobd数据库类型的数据全废了，好在没几个网站，这次从网上找修复Starting MySQL. ERROR! The server quit without updating PID file (/www/data/twk2.pid)的方法，找了很多但几乎没用，最好找把InnoDB类型的数据库导出方法才找到了，步骤：整体备份原来的数据库文件夹，删除数据库文件夹下面的ib_logfile0和ib_logfile1文件夹，然后修改数据库配置文件my.cnf，在 下面加入innodb_force_recovery=4，保存，连接ssh重启数据库服务，就可以启动起来了，现在登录phpmyadmin可以登录了，但这不是长久解决问题的办法，于是导出需要的innodb类型数据库文件，再导入到其它服务器上就可以读出来了。如果你卸载了原来的数据库重装了数据库，那只需要备份新数据库下面的ibdata1，拷入原来备份的数据库下面的ibdata1文件到新的数据库下面，按上面的步骤重新操作一次就可以了，导出数据库文件后，把备份的新安装的数据库下面的ibdata1文件恢复回去，删除ib_logfile0和ib_logfile1文件和数据库配置文件my.cnf里面之前加入的innodb_force_recovery=4，重启服务器导入你前面导出的.sql数据库文件就可以了。网上 其他那些修改数据库目录权限，把localhost修改成127.0.0.1那些方法试了都不起作用，修改后数据库服务该启不来还是启动不起来。 不明觉厉
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